容量法测定氧化钒中的各种价态钒

用NaOH溶液处理样品，分离V（V）然后以Fe(Ⅱ）滴定测定之。定量加入过量的V（V）到上述残渣中并用H2SO4溶解，用Fe(Ⅱ）滴定，计算出V（Ⅱ），V（Ⅲ）的含量。V（Ⅳ）的测定是通过从总钒量中扣除V（Ⅱ）、V（Ⅲ）、V（Ⅴ）的含量得到。V（Ⅱ）、V（Ⅲ）和V（Ⅴ）的回收率均大于96％，其8次测定结果的相对标准偏差分别为：9．8％、0．4％、1．2％；本法快速、简便，在实际应用中效果良好。

Volumetric Determination of the Valence States of Vanadium in Vanadium Oxide

Vanadium oxide sample was treated by NaOH solution to separate V, the V separated from the sample was titrated by Fe. Then a quantification of V was added in the residue for oxidizing the V and V, and the mixture was dissolved by H 2SO 4 and titrated by Fe, the content of VV can be calculated. The V was obtained by reducing the content of VV V in the total vanadium. The recovery of VVV was >96%; The relative standard deviation of VVV was 9.8%, 0.4%, 1.2% respectively. The method is simple and fast. It has been applied to the determination of valence states of vanadium in the vanadic oxide sample with satisfactory results.